LCM Alert Validation

Confidence

Failure Category

Lighting

Subcategory

Lighting - Failed Light

Sensor Verdict: The LCM alert on the GREEN (Right Turn) circuit is assessed as a confirmed 'Defect Detected' with 90% confidence. The technician's own diagnostic findings — 4 out of 6 LEDs operational on the mid turn signal — directly corroborate the sensor trigger. A partial LED failure of this nature reduces current draw below the LCM's expected threshold for a healthy circuit, which is precisely the type of fault the system is designed to catch. There is no conflicting evidence suggesting a false positive.

Photo Evidence: Only one photo was provided (MUDFLAPS.jpeg), which shows the mud flap area near the rear axle of the trailer. This photo contains no useful diagnostic information related to the GREEN circuit defect or the mid turn signal repair. There are no photos of the defective fixture illuminated (or partially illuminated), no photos of the replacement fixture installed and functioning, no nosebox wiring photo, and no TechAssist app screenshot showing verified circuit status. The technician's own notes acknowledge the defect was 'hard to see in pic,' but no attempt was made to provide a closer or better-angle photo of the affected lamp. Photo documentation for this work order is effectively non-compliant.

Vendor Compliance: The vendor did not follow the LCM troubleshooting procedure as instructed. The procedure explicitly requires use of the Phillips Connect TechAssist (PCT) app, photographs of each light illuminated, a clear nosebox wiring photo, and a TechAssist completion screenshot showing a green 'Verified' status beside each of the 5 circuits. None of these requirements were met. The vendor did correctly identify a failure subcategory consistent with the defined list ('light partial failure — portion of LEDs failed'), which is a positive note, but overall procedural compliance is inadequate.

Repair Summary: The repair performed was removal and replacement of the mid turn signal fixture on the right (curbside) side of the trailer, which aligns with the GREEN (Right Turn) alerting circuit. This is the correct component to address for this fault type. The repair appears appropriate and targeted. However, no parts line items were recorded in the work order, making it impossible to verify the brand or part number of the replacement fixture, or confirm whether a compliant/approved lamp was installed. The absence of line items is a documentation gap that should be flagged.

Key Concerns: Several concerns are worth flagging for this work order. First, the only submitted photo is of the mud flap — completely unrelated to the reported lighting defect — suggesting either a documentation error (wrong photo attached) or a very cursory documentation effort by the technician. Second, no line items were submitted, leaving no traceability for the replacement part. Third, the TechAssist app was not used and no verified circuit confirmation was provided, meaning there is no independent validation that the repair resolved the LCM fault or that other circuits are healthy. Finally, while the repair likely resolved the defect, the lack of post-repair verification leaves open the possibility of a recurring alert if the root cause (e.g., moisture intrusion, connector corrosion) was not fully addressed.